Note 4 - Loans and Allowance for Credit Losses on Loans - Credit Card Loan Payment Activity (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Loans	[1],[2]	$ 4,847,683	$ 4,169,303
Credit Card Receivable [Member]
Loans		20,732	17,087
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans	[1]	20,732	17,087
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Performing Financial Instruments [Member]
Loans		20,732	17,087
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Nonperforming Financial Instruments [Member]
Loans		$ 0	$ 0

[1] Pursuant to the CARES Act, loan deferrals granted to borrowers experiencing business interruptions related to the pandemic were not classified as TDRs and not included in past due and/or non-performing loan statistics. As of March 31, 2022 and December 31, 2021, outstanding CARES Act loan deferrals of $165,000 and $169,000 are reflected as current, respectively.

[2] Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.